The Okapi BM25 scoring function. More...

#include <okapi_bm25.h>

Inheritance diagram for meta::index::okapi_bm25:

Public Member Functions
	okapi_bm25 (double k1=default_k1, double b=default_b, double k3=default_k3)

double	score_one (const score_data &sd) override

Public Member Functions inherited from meta::index::ranker
std::vector< std::pair< doc_id, double > >	score (inverted_index &idx, corpus::document &query, uint64_t num_results=10, const std::function< bool(doc_id d_id)> &filter=[](doc_id){return true;})

virtual double	initial_score (const score_data &sd) const
	Computes the constant contribution to the score of a particular document. More...

virtual	~ranker ()=default
	Default destructor.

Static Public Attributes
static const std::string	id = "bm25"
	The identifier for this ranker.

static const constexpr double	default_k1 = 1.2
	Default k1, doc term smoothing.

static const constexpr double	default_b = 0.75
	Default b, length normalization.

static const constexpr double	default_k3 = 500.0
	Default k3, query term smoothing.

Detailed Description

The Okapi BM25 scoring function.

Constructor & Destructor Documentation

Parameters

double meta::index::okapi_bm25::score_one ( const score_data & sd )

overridevirtual

Parameters

sd	score_data for the current query

The documentation for this class was generated from the following files: